Electropneumatic tool.



w.'z. mm; ELEGTR'OPNEUMATIG TOOL. APPLICATION FILED MAY-29, 190B.

vit'neooeo a) i i I I mm? j Patented June 8,1909.

UNETEQ, sTATEs PATENT OFFICE.

WILLIAM a. ViIARD, or s nAoUsE, NEW roiin assleuon'ro THE PNEUMELEcTEIo MACHINE COMPANY, or SYRACUSE, NEW YORK, A ooRYeEnTIoN OF NEW YORK.

ELEGTROPNEUMATIC. TOOL.

new and useful Improvements in Electropi'icumatie Tools, of which the following is a SpQClfiCittlOll. i

My invention relates to tools or apparatus wherein airis compressed by an electrically. driven piston and utilized for the performance of work, and the object of my invention is to establish such relation between the drivenzand driving parts that each charge of air drawn in by the compressing piston will be caused to circulate'through the actuated motor in such a manner as'to keep the latter cool. j I r v lily invention consists in certain novel features of construction in an apparatus'of this kind wherein the stated object may be carried out without undue complication of parts or increase in weight-ordimensions, as will hereinafter be fully described and particularly pointed out in the claims.

Asnny invention has been designed with particular reference to electro-pneumatic percussion tools, I haveillustrated the same as embodied in a machine of this character and have shown the same in the accompanying drawing in vertical longitudinal section taken in the plane of the. axes of the motor and the'compressing piston. p I

l represents the motor arn'iature which is mounted upon the vertic'alshaftl and 2 repre a bottom wall & and-a top or cover 5. The

sents the field magnets carried by thenetic-frame 3. The motor. is housed in a ng made up'olathe magnetic frame. 3, i

4 Specification of Letters Patent. Application filed May 29, 1908'. Serial No. 436,778.

" bottom wall is provided with an 'airinlet (3 uhile the top is constructeddo provide an m v y, I air outlet 1 whlch inlet and outlet adapt the ,niotoi' housing for the cirvuhitionof a cool- 1 ing current of air around the poles and 1 through the armature and its commutator, the armature being open wound and. the

pommutator being perforated to permit ol f such"circulation. lieneaih the inotrir {hous 3 ing is a 'gearcasu gear which eoi'mei, ture with the chamber whichlias' aiifo utlct 11 corr spomling imposition to the airinlet (i of thc i 8 in which located the: llie slmtt-to the arma the inner transiei se' walllf) of this casing 1 scparal the latter .iti oin an..air collecting L Patented June 8, 1909.

motor housing and an air intake 12 at the bottom of the machine The forward wall 13 of the chamber 10 constitutes the rear wallof the compression space of the air pumping means and carries cylindrical bosses 1 1' which receive piston rod 15 of the air compressing means, which is suitably packed by the gland 16. Inasmuch as the rod 15 receives Its lubrication from the gear case 8, and distribution of oil in the chamber 10 is undesirab1e,the gland 16 carries an extension 16? surrounding the rod 15 and-terminating in the wall 9, where it is packed by the packing 17-47. Extension '16 is sufficiently loose upon the rod 15 t permit bearing 14L v In order 'to protect the intake 12 from dust which, in a mine where-the illustrative machine is intended to be used, said intake is provided with a screen 18 of fine mesh wire cloth mounted upon a frame 19 which is slid into position across the intake and held there by a spring 20.

21 and 22 represent nut the lubricant to be carried into th packed locks for the packing ring 17 and gland 16, respectively.

"compression cylinder.

29 re nes'ents apiston which, in the type of machine selected for-illustrating my invention, is driven forward to deliver a workingstroke by each charge ofair COlllPlQSiGd by the piston 26, the forward stroke of said piston 29 being followed by the forward movement of the piston 26 which-sucks in a ncw'charge of-air previous to a new coinp ession and a. repetition of the cycle of movementsdescribed. Each charge of air drawn in by the piston 2 after-being separated from harmful dust by the screen 18, passes through the coilection chamber 10. and openings 1,]. and into the. motor casiiig,.whcr'e it irculates freely among the parts of the motor-an d then passesfito outletand downialrefl ito tlie;cylinrle1. 95. By the construction describedabove,ithe motor is kept. roolwi thout lllliQHftl addt I tion'of complication or Weight to the parts;

- ing cylinder,

i the downtake leadingfrom the outlet of the r,

I claim and desire to secure by Letters Pat out is:

-. looting chamber into the gear casing, and the 1 I compressioncylinder, and cpntaining a chock moreover, by providing the motor with a coolin device of the etiiciency of that describe the parts may bemade much more compact and the proportions correspondportable machines controlled byhand.

Having thus described my invention, what 1.,ln-a machine of the character described, 5 the combination of the vertically disposed motor having ahousing provided with an air inlet at bottom and an air outlet at top, an air. compressing cylinder containing a piston drawing in a charge of air previous to coinpressinglthe same, located adjacent to tliemotor housing, and an air passage connecting the air outlet of the motor housing with the inlet port of the air compressl 2., In a IlltLClllllQ of the character described,

l the combination of the motor, the motor E 5 housing provided with a lowerair inlet and upper air outlet, the air collecting chamber located beneath the motor housing, coinl mun'icating at top with the motor housing and having an intake at bottom, the compression cylinder having an air compressing piston located below the motor housing and motor, housing to the inlet port of the compression cylinder. l 3. In a machine of the character described the combination of a vertically disposedino i tor, the motor housing surrounding the same i provided with an air inlet at bottom and an l air outlet-at top, the gear casing provided l with a driving gear located beneath the mo- I tor housing, the air. collection chamber '10- rated beneath and connected at its top with the motorliousing, located in line with the gear easing, .alKllULVlllg; an air intake at 1 bottom, the air compression cylinder in line with the gear casing and air collecting cliainbei',-tlie piston in said cylinder having a pistonrod extending through the. air colclo viitalre leading from the outlet of the m0- tor casing to the inlet of the compression cylinder. g

' 4-. In a machine N of the character described, the combination with the motor housing containing the motor-and having suitable through tlie-inoto1',"the gear casing-and air collecting chamber located beneath the motor I i the housing, the compression cylinder containing a piston having its piston rod working through the walls of the collecting chamber and extending into the gear casing, and a I 1;;baclzing for the piston rod in one oi said ngly 'educed, which is a very important, consideration in walls, having an extension surrounding the piston rod and terminating in the other oil said walls] I In an electrically actuated pneumatic machine, the combination of .tlie compressing cylinder having an intake, the vertically disposed motor, then'i'otor housing therefor having an air inlet at bottom and an'air ontlct at top, a duct communicating between the air outlet '01 the motor "housing and the intake of'tlie compressing cylinder, the air collecting chamber located beneath and com ni'unicating at its top \vitlrthe motor housing and having an air intake at bottom, and

i the screen extending. across the said air intake.

(3. In an electrically actuated pneumatic machine, the combination of the compressing cylinder having an intake for air, the vertically disposed motor,-the motor housing therefor, having an air inlet at bottom and ah air outlet at top, a duct communicating between the air outlet of the housing and the intake of the cylinder, the air collecting chamber located beneath and communicat ng at its top'ivith the inlet of the motor housing and having an air intalgejat bottom, and the screen extending across the air intake, of the collecting chamber, comprising a suitable strainingcloth, a frame upon Vl.11Cl1 the cloth is mounted, and a spring inter )osed betu'ecnthe frame and a fixed part roi' iol ling the frame in position.

7. In a machine of the character described combination of the vertically disposed lll()l()1. il10 housing surrounding the same and provided with a bottom inlet and a top outlet, the. gear ,casing' located beneath the motor housing. the compression cylinderlocated in line with the gear casiin and having a piston with piston i'o(l cxtending into the gear casing, and acombined do vnt akc and valve housing located beneath the air outlet of the motor housing and the air inlet of the valve closing under back pressure in' said 'doivntake. h, I p The foregoing specification signed at llcil- --\vood, Pa, this "24th day of March, 1008.

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